From ec207b7a6340493e957b4e6fc6b60f148e61e7be Mon Sep 17 00:00:00 2001
From: Hari Nair <Hari.Nair@jhuapl.edu>
Date: Fri, 25 Apr 2025 17:40:57 +0000
Subject: [PATCH] add -lm to gsl link flags

---
 support-libraries/altwg/install-altwg.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/support-libraries/altwg/install-altwg.sh b/support-libraries/altwg/install-altwg.sh
index 091450e..ec696b8 100755
--- a/support-libraries/altwg/install-altwg.sh
+++ b/support-libraries/altwg/install-altwg.sh
@@ -42,6 +42,10 @@ if [ ! -d $GSL_HOME ]; then
     fi
     tar xfz gsl-${GSL_VERSION}.tar.gz
     (
+        if [ "$(uname)" == "Linux" ]; then
+            # Not sure why, but -lm is needed on some Linux systems
+            LDFLAGS="${LDFLAGS} -lm"
+        fi
         cd gsl-${GSL_VERSION}
         ./configure --prefix ${GSL_HOME}
         # make install cannot find certain header files?